Depending on how you use the knife, Case's thin hollow grind, to a very thin edge, is a fantastic slicer. Case has also done pretty well in recent years with putting fairly acute edge bevels on these. When I bought my stainless Sod Buster Jr. at a local big-box home improvement center, I was impressed to find a beautifully-executed edge grind on it, all the way to the very pointy and sharp tip (this can be rare; tips are often not completely finished). I've still fine-tuned the edge on it, and this knife is a great tomato/fruit/veggie slicer. The thin grind and thin edge also make this blade very, very easy to sharpen up.
The Queen CC's primary grind and edge are considerably thicker, and odds are pretty good you'll want to re-bevel it to something thinner. But the D2 is obviously a big draw, with this knife.
I don't have the GEC, but in terms of edge grind (as seen in pics), it looks very similar to the Queen, to me.
David